Não informado. (1971). IDS Communication. University of Sussex, Institute of Development Studies.
Chicago (17e ed.) BronvermeldingNão informado. IDS Communication. Brighton, Inglaterra: University of Sussex, Institute of Development Studies, 1971.
MLA (8e ed.) BronvermeldingNão informado. IDS Communication. University of Sussex, Institute of Development Studies, 1971.
Let op: Deze citaties zijn niet altijd 100% accuraat.